Polished Green Opal rock GRN89 toredo Dimensions at widest points approximately

Dimensions at widest points approximately 130 mm x  90 mm x 65 mm thick

Approximate dimensions at widest points 120 mm long  x 100 mm  x 30 mm thick

60 mm x 45 mm  x 16 mm

Age is Palaeoproterozoic (1

From near Tamworth

Polished Green Opal rock GRN89 toredo Dimensions at widest points approximatelyGRN89 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 210 mm x 60 mm x 65 mm thick Weighs 1,406 grams Green Opal occurs at a location south of Kalgoorlie in the Eastern Goldfields of Western Australia. The green colouration is caused by traces of nickel and or chromium. Sometimes it exhibits striking contrasting veins of magnesite.